This incident has been resolved.

A fix has been implemented and we are monitoring the results.

We are still in contact with third parties for the resolution.

We are still in contact with third parties and waiting for the resolution.

Update from the original incident message to better reflect the situation about the countrywide issue.

We are currently having issues to place or receive international calls.
As this is a countrywide issue impacting whole Germany, we are dependent on third parties for the resolution. If you require immediate assistance, please create a ticket in our support page (support.teamviewer.com).
We will update our status page with new information as soon as possible.